Magadha was a kingdom in India. It was one of the bigger Mahajanapadas.
In the Dvapara Yuga, it was ruled by Brihadratha and his son Jarasandha. During the Kaliyuga, it was ruled by Bimbisara and Ajatashatru, then Chandragupta Maurya and King Ashoka.
King Alexander army mutinied against him at the borders of Magadha during their conquest of Asia. (PROSE: Dharmayuddha)